What is the optimal way to find the missing element in array b from below arrays?

Question

Ex: Array a =[1,2,3,4,5,6,7,8,910]
Array b =[3,2,10,9,7,6,8,1,5]
Here element 4 exists in array a but missing in array b.

Answer 1

Is your array "a" correct [......910] or should it be [......9, 10]?
If it's [...9, 10] then..for python...just do:-
a =[1,2,3,4,5,6,7,8,9,10]
b =[3,2,10,9,7,6,8,1,5]
print(sum(a) - sum(b))

Answer 2

Mirielle👽 thank you for your quick response, we need to print or identify the missing element in array b which is there in array a, but you are printed only True or false instead of missing element.

Answer 3

rodwynnejones thanks for your intelligent answers

Answer 4

~ swim ~ thanks for your multiple solutions, all are great.